facets-8.x-1.x-dev/tests/facets_processors_collection/facets_processors_collection.module

<?php

/**
 * @file
 * The facets processors collection module.
 */

/**
 * Implements hook_facets_search_api_query_type_mapping_alter().
 */
function facets_processors_collection_facets_search_api_query_type_mapping_alter($backend_plugin_id, array &$query_types) {
  if (
    !empty($query_types['string'])
    && $query_types['string'] === 'search_api_string'
    && \Drupal::state()->get('facets_processors_collection_alter_string_query_handler', FALSE)
  ) {
    $query_types['string'] = 'search_api_string_cached';
  }
}